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Wired connection doesn't work. eth0 : no such device

hello,
I'm using HP dv6226 laptop. Installed ubuntu 10.10 inside windows 7, dual boot. My internet works perfectly in windows 7 but doesnt seem to work in ubuntu. I've been searching for a good solution and tried everything I found. These are the outputs for the commands.

$ sudo ifup eth0
SIOCSIFADDR: No such device
eth0: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
eth0: ERROR while getting interface flags: No such device
Failed to bring up eth0.